A kind of hybrid polyester resin for indoor thermal transfer matt powder coating and preparation method thereof

Abstract

The invention discloses mixed polyester resin for an indoor thermal transfer printing matt powder coating. The resin is carboxyl-terminated saturated polyester resin, and has an acid value of 45-75 mgKOH / g, a glass transition temperature of 55-60 DEG C, a softening point of 93-103 DEG C, a melt viscosity of 3000-4500 mPa*s at 200 DEG C and reactivity of 150-250 s at 180 DEG C, and the resin is mainly prepared by performing a melt polycondensation reaction on the following monomer components in percent by mass: 30-37% of a diol, 0-3% of a trihydric alcohol, 55-62% of an aromatic dibasic acid,0-5% of a fatty acid, 5-10% of an acidolysis agent, 0.01-0.15% of an esterifying catalyst and 0.01-0.8% of a thermal transfer printing assistant. The polyester resin has a high glass transition temperature, good storage stability, and a good appearance levelling property. The invention also discloses a preparation method of the mixed polyester resin for the indoor thermal transfer printing matt powder coating.

Description

technical field [0001] The invention belongs to the technical field of polyester resins, in particular to a hybrid polyester resin for indoor thermal transfer matte powder coatings and a preparation method thereof. Background technique [0002] At present, the application of powder coatings in the field of decoration is becoming more and more extensive, and the varieties are increasing, but the main ones are high-gloss types. With the improvement of production quality, people are no longer satisfied with the monotonous gloss, so decorative powder coatings with different glosses came into being. The surface gloss of the coating film is selected according to subjective and objective conditions such as the user's aesthetics and actual use requirements. In general, noble, beautiful, and luxurious decorations require high gloss, while quiet, comfortable, and elegant environments require lower gloss. Usually outdoor machinery, car casings, etc. require high gloss, while indoor a...

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Problems solved by technology

[0005] CN101704945A discloses a polyester resin for hybrid powder coatings and a preparation method thereof, and proposes a preparation method for thermal transfer products suitable for high-gloss, low-temperature curing fields. Due to poor matting properties, the matting powder coatings prepared by the resin The impact resistance of the cured coating is poor, so this resin is not suitable for matt heat transfer products

[0006] CN 102190786 A discloses a matting polyester resin and its preparation method. It provides a method for preparing a polyester resin for powder coatings with stable indoor matting polyester matting effect and good film performance, but it does not belong to heat transfer printing In the field, although it belongs to indoor matting, if it is applied to thermal transfer printing, there will be tearing paper sticking paper and unclear transfer printing

Similar patents include CN105254863A and CN105199088A. These two patents also belong to the field of indoor matting, but neither of them can be used in the field of heat transfer printing.

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